How to enable DGN files with any extension

Summary

This topic shows how to programmatically set the computer-aided design (CAD) DGN setting that instructs ArcMap and ArcCatalog to examine all files for the DGN format. The results of the code are printed to the console for demonstration purposes. This setting can also be set manually by the user with the graphical interface for Options on the CAD tab.

Enabling DGN files with any file extension

1. Instantiate a CAD Workspace Factory.
2. Cast the workspace factory to the ICadSettings interface.
3. Set the EnableAllDgnFileExtensions property to true to enable support to examine all files for the DGN format.

[C#]

//Set CadSettings to a new CadWorkspaceFactory.
ESRI.ArcGIS.DataSourcesFile.ICadSettings pCadSettings=new
    ESRI.ArcGIS.DataSourcesFile.CadWorkspaceFactory()as
    ESRI.ArcGIS.DataSourcesFile.ICadSettings;
//Enable support to examine all files for DGN format.
pCadSettings.EnableAllDgnFileExtensions=true;
//Print the results to the console.
Console.WriteLine("EnableAllDgnFileExtensions={0}",
    pCadSettings.EnableAllDgnFileExtensions);

[VB.NET]

'Set CadSettings to a new CadWorkspaceFactory.
Dim pCadSettings As ESRI.ArcGIS.DataSourcesFile.ICadSettings=TryCast(New ESRI.ArcGIS.DataSourcesFile.CadWorkspaceFactory(), ESRI.ArcGIS.DataSourcesFile.ICadSettings)
'Enable support to examine all files for DGN format.
pCadSettings.EnableAllDgnFileExtensions=True
'Print the results to the console.
Console.WriteLine("EnableAllDgnFileExtensions={0}", pCadSettings.EnableAllDgnFileExtensions)

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To use the code in this topic, reference the following assemblies in your Visual Studio project. In the code files, you will need using (C#) or Imports (VB .NET) directives for the corresponding namespaces (given in parenthesis below if different from the assembly name):

• ESRI.ArcGIS.System (ESRI.ArcGIS.esriSystem)
• ESRI.ArcGIS.Version (ESRI.ArcGIS)
• ESRI.ArcGIS.DataSourcesFile
• ESRI.ArcGIS.Geodatabase

Development licensing	Deployment licensing
ArcGIS for Desktop Basic	ArcGIS for Desktop Basic
ArcGIS for Desktop Standard	ArcGIS for Desktop Standard
ArcGIS for Desktop Advanced	ArcGIS for Desktop Advanced